BMW R 1200 GS Rider's Manual page 118

Check the brake-fluid
8
level, front brakes
A low fluid level in the
114
brake reservoir can allow air
to penetrate the brake system.
This significantly reduces braking
efficiency.
Check the brake-fluid level at
regular intervals.
Make sure the ground is level
and firm and place the motor-
cycle on its centre stand.
Move the handlebars to the
z
straight-ahead position.
Check the brake fluid level in
front reservoir 1.
Wear of the brake pads
causes the brake fluid level
in the reservoir to sink.
Brake fluid level, front
DOT4 brake fluid
Do not permit the brake fluid
level to drop below the MIN
mark. (Brake-fluid reservoir
horizontal, motorcycle up-
right)
If the brake fluid level drops be-
low the permitted level:
Have the defect rectified as
quickly as possible by a spe-
cialist workshop, preferably
an authorised BMW Motorrad
dealer.